2. Palabras Planas

When speaking, you should load the tonal intensity in the penultimate syllable. For example: libro, álbum, mostaza, pote, olla, césped.

They get accent mark when:

They end in consonant other than N or S. (Examples: mártir, lápiz, árbol, huésped)

They end in two vowels, if the first one is weak and on it falls the tonal intensity.

Although they are followed by N or S. (Examples: mío, ría, alegría).

There are very few cases of flats finished in N or S that are accentuated when this letter is preceded by another consonant. Unless it is precisely n, o, or s. (Examples: bíceps, fórceps, tríceps). So it is better for you to just memorize them and get it over with.

6. Accent in capital letters

In Spanish, capital letters can be accentuated. This can be useful when accentuation rules require capital letters to be accentuated. (Examples: África, BOGOTÁ).

Spelling accent should be placed even in abbreviations. (Examples: María de los Ángeles> Maria de los Á).

They do not carry tilde the acronyms that are written entirely in capital letters. (Example: L.A Los Ángeles).

I know that accentuation in Spanish is an issue that foreign students prefer to study when they have a more advanced level of the language. However, local Spanish speakers were taught about accent almost from the beginning. Why? Because correct accentuation positively influences pronunciation and phonetics when speaking in Spanish.

If your desire is to have your written Spanish to be at a fluent level, then my tip is to gradually pay attention to the tildes.